I need help with my internet?

I need help with my internet?
Is their a way i can bump people off using my internet with out changing the password?
Okay so i have a laptop and a ipod and i want the person who use the ipod to stop using the internet is their a way i can just bump him of using the internet ? or do i have to change the password ? Because i really do want to have to change the password
thanks!
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